Suppression of beam induced pulse shortening modes in high power RF generator TW output structures
Several different style 11.4 GHz relativistic klystrons, operating with beam pulse widths of 50 ns and using large aperture, tapered phase-velocity TW structures,` have recently demonstrated output RF power levels in the range of 100 to 300 MW without breakdown or pulse shortening. To extend this performance into the long pulse regime (1 {mu}s) or to demonstrate a threefold increase in output power by using higher currents, the existing TW circuit designs must be modified (a) to reduce the cavity maximum surface E-fields by a factor of 2 to 3, and (b) to elevate the current threshold values of the beam induced higher order modes (HOM) to ensure avoidance of RF pulse shortening and associated instabilities. A technique for substantially elevating this threshold current is described, and microwave data and photographs are presented showing the degree of HOM damping achieved in a recently constructed 11.4 GHz TW structure.
- Research Organization:
- Haimson Research Corp., Palo Alto, CA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States)
- DOE Contract Number:
- FG03-92ER81285
- OSTI ID:
- 434407
- Report Number(s):
- CONF-920124-31; ON: DE96015236
- Resource Relation:
- Conference: Society of Photo-Optical Instrumentation Engineers (SPIE) international symposium on laser spectroscopy, Los Angeles, CA (United States), 19-24 Jan 1992; Other Information: PBD: [1992]
- Country of Publication:
- United States
- Language:
- English
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